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<pre><code class="lang-text">&#x5728;HotSpot&#x865A;&#x62DF;&#x673A;&#x4E2D;&#xFF0C;&#x5BF9;&#x8C61;&#x5728;&#x5185;&#x5B58;&#x4E2D;&#x5B58;&#x50A8;&#x7684;&#x5E03;&#x5C40;&#x5206;&#x4E3A;
&#x5BF9;&#x8C61;&#x5934;Header&#x3001;&#x5B9E;&#x4F8B;&#x6570;&#x636E;Instance Data&#x3001;&#x5BF9;&#x9F50;&#x586B;&#x5145;Padding&#x3002;

// &#x5BF9;&#x8C61;&#x5934; 
object header , &#x5305;&#x62EC;&#x4E86;&#x5173;&#x4E8E;&#x5806;&#x5BF9;&#x8C61;&#x7684;&#x5E03;&#x5C40;&#x3001;&#x7C7B;&#x578B;&#x3001;GC&#x72B6;&#x6001;&#x3001;&#x540C;&#x6B65;&#x72B6;&#x6001;&#x548C;&#x6807;&#x8BC6;&#x54C8;&#x5E0C;&#x7801;&#x7684;&#x57FA;&#x672C;&#x4FE1;&#x606F;&#x3002;
Java&#x5BF9;&#x8C61;&#x548C;vm&#x5185;&#x90E8;&#x5BF9;&#x8C61;&#x90FD;&#x6709;&#x4E00;&#x4E2A;&#x5171;&#x540C;&#x7684;&#x5BF9;&#x8C61;&#x5934;&#x683C;&#x5F0F;&#x3002;

// &#x5B9E;&#x4F8B;&#x6570;&#x636E;
Instance Data ,&#x4E3B;&#x8981;&#x662F;&#x5B58;&#x653E;&#x7C7B;&#x7684;&#x6570;&#x636E;&#x4FE1;&#x606F;&#xFF0C;&#x7236;&#x7C7B;&#x7684;&#x4FE1;&#x606F;&#xFF0C;&#x5BF9;&#x8C61;&#x5B57;&#x6BB5;&#x5C5E;&#x6027;&#x4FE1;&#x606F;&#x3002;

// &#x5BF9;&#x9F50;&#x586B;&#x5145;
Padding, &#x4E3A;&#x4E86;&#x5B57;&#x8282;&#x5BF9;&#x9F50;&#xFF0C;&#x586B;&#x5145;&#x7684;&#x6570;&#x636E;&#xFF0C;&#x4E0D;&#x662F;&#x5FC5;&#x987B;&#x7684;&#x3002;
&#x5BF9;&#x9F50;&#x586B;&#x5145;&#x5E76;&#x4E0D;&#x662F;&#x5FC5;&#x7136;&#x5B58;&#x5728;&#x7684;&#xFF0C;&#x65E0;&#x7279;&#x522B;&#x542B;&#x4E49;&#xFF0C;&#x8D77;&#x7740;&#x5360;&#x4F4D;&#x7B26;&#x7684;&#x4F5C;&#x7528;&#xFF0C;
HotSpotVM&#x7684;&#x81EA;&#x52A8;&#x5185;&#x5B58;&#x7BA1;&#x7406;&#x7CFB;&#x7EDF;&#x8981;&#x6C42;&#x5BF9;&#x8C61;&#x8D77;&#x59CB;&#x5730;&#x5740;&#x5FC5;&#x987B;&#x662F;8&#x5B57;&#x8282;&#x7684;&#x6574;&#x6570;&#x500D;&#xFF0C;&#x4E5F;&#x5C31;&#x662F;&#x5BF9;&#x8C61;&#x7684;&#x5927;&#x5C0F;&#x5FC5;&#x987B;&#x662F;8&#x5B57;&#x8282;&#x7684;&#x6574;&#x6570;&#x500D;&#xFF0C;
&#x5BF9;&#x8C61;&#x5934;&#x6B63;&#x597D;&#x662F;8&#x5B57;&#x8282;&#x7684;&#x500D;&#x6570;&#xFF0C;&#x6240;&#x4EE5;&#x5F53;&#x5BF9;&#x8C61;&#x5B9E;&#x4F8B;&#x6570;&#x636E;&#x90E8;&#x5206;&#x6CA1;&#x6709;&#x5BF9;&#x9F50;&#xFF0C;&#x5C31;&#x9700;&#x8981;&#x901A;&#x8FC7;&#x5BF9;&#x9F50;&#x586B;&#x5145;&#x6765;&#x8865;&#x5168;&#x3002;

&#x5BF9;&#x4E8E;Java&#x548C;C&#x3001;C++&#x3001;C#&#x8FD9;&#x7C7B;&#x9AD8;&#x7EA7;&#x8BED;&#x8A00;&#xFF0C;&#x56E0;&#x4E3A;&#x7F16;&#x8BD1;&#x5668;&#x7684;&#x5B58;&#x5728;&#xFF0C;
&#x7F16;&#x8BD1;&#x5668;&#x6216;&#x865A;&#x62DF;&#x673A;&#x4F1A;&#x81EA;&#x52A8;&#x5E2E;&#x6211;&#x4EEC;&#x8FDB;&#x884C;&#x5B57;&#x8282;&#x5BF9;&#x9F50;&#x8865;&#x767D;&#x3002;&#x65E0;&#x9700;&#x624B;&#x52A8;&#x53BB;&#x5904;&#x7406;&#x3002;
</code></pre>
<p><img src="../pics/&#x5BF9;&#x8C61;&#x5185;&#x5B58;&#x5E03;&#x5C40;.png" alt=""></p>
<h2 id="&#x4E3A;&#x4EC0;&#x4E48;&#x8981;&#x8FDB;&#x884C;&#x5185;&#x5B58;&#x5BF9;&#x9F50;"><a name="&#x4E3A;&#x4EC0;&#x4E48;&#x8981;&#x8FDB;&#x884C;&#x5185;&#x5B58;&#x5BF9;&#x9F50;" class="anchor-navigation-ex-anchor" href="#&#x4E3A;&#x4EC0;&#x4E48;&#x8981;&#x8FDB;&#x884C;&#x5185;&#x5B58;&#x5BF9;&#x9F50;"><i class="fa fa-link" aria-hidden="true"></i></a>1.1. &#x4E3A;&#x4EC0;&#x4E48;&#x8981;&#x8FDB;&#x884C;&#x5185;&#x5B58;&#x5BF9;&#x9F50;</h2>
<pre><code class="lang-text">// &#x5E73;&#x53F0;&#x539F;&#x56E0;
&#x4E0D;&#x662F;&#x6240;&#x6709;&#x7684;&#x786C;&#x4EF6;&#x5E73;&#x53F0;&#xFF08;&#x4F8B;&#x5982;&#x67D0;&#x4E9B;&#x5D4C;&#x5165;&#x5F0F;&#x7CFB;&#x7EDF;&#x4E2D;&#x4F7F;&#x7528;&#x7684;&#x4F4E;&#x7AEF;&#x5FAE;&#x5904;&#x7406;&#x5668;&#xFF09;&#x90FD;&#x80FD;&#x8BBF;&#x95EE;&#x4EFB;&#x610F;&#x5730;&#x5740;&#x4E0A;&#x7684;&#x4EFB;&#x610F;&#x6570;&#x636E;&#xFF0C;
&#x67D0;&#x4E9B;&#x786C;&#x4EF6;&#x5E73;&#x53F0;&#x53EA;&#x80FD;&#x8BBF;&#x95EE;&#x5BF9;&#x9F50;&#x7684;&#x5730;&#x5740;&#xFF0C;&#x5426;&#x5219;&#x4F1A;&#x51FA;&#x73B0;&#x786C;&#x4EF6;&#x5F02;&#x5E38;&#x3002;

// &#x6027;&#x80FD;&#x539F;&#x56E0;
&#x5982;&#x679C;&#x6570;&#x636E;&#x5B58;&#x653E;&#x5728;&#x672A;&#x5BF9;&#x9F50;&#x7684;&#x5185;&#x5B58;&#x7A7A;&#x95F4;&#x4E2D;&#xFF0C;&#x5219;&#x5904;&#x7406;&#x5668;&#x8BBF;&#x95EE;&#x53D8;&#x91CF;&#x65F6;&#x9700;&#x8981;&#x505A;&#x4E24;&#x6B21;&#x5185;&#x5B58;&#x8BBF;&#x95EE;&#xFF0C;
&#x800C;&#x5BF9;&#x9F50;&#x7684;&#x5185;&#x5B58;&#x8BBF;&#x95EE;&#x4EC5;&#x9700;&#x8981;&#x4E00;&#x6B21;&#x8BBF;&#x95EE;&#x3002;
&#x663E;&#x7136;&#xFF0C;&#x5185;&#x5B58;&#x5BF9;&#x9F50;&#x5728;&#x67D0;&#x4E9B;&#x60C5;&#x51B5;&#x4E0B;&#x53EF;&#x4EE5;&#x51CF;&#x5C11;&#x8BFB;&#x53D6;&#x5185;&#x5B58;&#x7684;&#x6B21;&#x6570;&#x4EE5;&#x53CA;&#x4E00;&#x4E9B;&#x8FD0;&#x7B97;&#xFF0C;&#x6027;&#x80FD;&#x66F4;&#x9AD8;&#x3002;
&#x53E6;&#x5916;&#xFF0C;&#x7531;&#x4E8E;&#x5185;&#x5B58;&#x5BF9;&#x9F50;&#x4FDD;&#x8BC1;&#x4E86;&#x8BFB;&#x53D6; b &#x53D8;&#x91CF;&#x662F;&#x5355;&#x6B21;&#x64CD;&#x4F5C;&#xFF0C;&#x5728;&#x591A;&#x6838;&#x73AF;&#x5883;&#x4E0B;&#xFF0C;&#x539F;&#x5B50;&#x6027;&#x66F4;&#x5BB9;&#x6613;&#x4FDD;&#x8BC1;&#x3002;

&#x4F46;&#x662F;&#x5185;&#x5B58;&#x5BF9;&#x9F50;&#x63D0;&#x5347;&#x6027;&#x80FD;&#x7684;&#x540C;&#x65F6;&#xFF0C;&#x4E5F;&#x9700;&#x8981;&#x4ED8;&#x51FA;&#x76F8;&#x5E94;&#x7684;&#x4EE3;&#x4EF7;&#x3002;
&#x7531;&#x4E8E;&#x53D8;&#x91CF;&#x4E0E;&#x53D8;&#x91CF;&#x4E4B;&#x95F4;&#x589E;&#x52A0;&#x4E86;&#x586B;&#x5145;&#xFF0C;&#x5E76;&#x6CA1;&#x6709;&#x5B58;&#x50A8;&#x771F;&#x5B9E;&#x6709;&#x6548;&#x7684;&#x6570;&#x636E;&#xFF0C;&#x6240;&#x4EE5;&#x5360;&#x7528;&#x7684;&#x5185;&#x5B58;&#x4F1A;&#x66F4;&#x5927;&#x3002;
&#x8FD9;&#x4E5F;&#x662F;&#x4E00;&#x4E2A;&#x5178;&#x578B;&#x7684;&#x7A7A;&#x95F4;&#x6362;&#x65F6;&#x95F4;&#x7684;&#x5E94;&#x7528;&#x573A;&#x666F;&#x3002;
</code></pre>
<h2 id="&#x5982;&#x4F55;&#x89E3;&#x51B3;-&#x5185;&#x5B58;&#x5BF9;&#x9F50;-&#x5E26;&#x6765;&#x7684;&#x5185;&#x5B58;&#x6D6A;&#x8D39;&#x95EE;&#x9898;"><a name="&#x5982;&#x4F55;&#x89E3;&#x51B3;-&#x5185;&#x5B58;&#x5BF9;&#x9F50;-&#x5E26;&#x6765;&#x7684;&#x5185;&#x5B58;&#x6D6A;&#x8D39;&#x95EE;&#x9898;" class="anchor-navigation-ex-anchor" href="#&#x5982;&#x4F55;&#x89E3;&#x51B3;-&#x5185;&#x5B58;&#x5BF9;&#x9F50;-&#x5E26;&#x6765;&#x7684;&#x5185;&#x5B58;&#x6D6A;&#x8D39;&#x95EE;&#x9898;"><i class="fa fa-link" aria-hidden="true"></i></a>1.2. &#x5982;&#x4F55;&#x89E3;&#x51B3; &#x5185;&#x5B58;&#x5BF9;&#x9F50; &#x5E26;&#x6765;&#x7684;&#x5185;&#x5B58;&#x6D6A;&#x8D39;&#x95EE;&#x9898;</h2>
<pre><code class="lang-text">&#x6709;&#x5185;&#x5B58;&#x5BF9;&#x9F50;&#x5C31;&#x4F1A;&#x6709;&#x5185;&#x5B58;&#x6D6A;&#x8D39;&#x7684;&#x60C5;&#x51B5;&#xFF0C;&#x6240;&#x4EE5;&#x4E3A;&#x4E86;&#x51CF;&#x5C11;&#x5185;&#x5B58;&#x6D6A;&#x8D39;&#xFF0C;
&#x5E76;&#x8FBE;&#x5230;&#x5185;&#x5B58;&#x5BF9;&#x9F50;&#x7684;&#x76EE;&#x7684;&#xFF0C;JVM&#x5C31;&#x4F1A;&#x5C06;&#x5B57;&#x6BB5;&#x91CD;&#x65B0;&#x6392;&#x5217;&#x3002;

java -version   // &#x67E5;&#x770B;&#x865A;&#x62DF;&#x673A;&#x7C7B;&#x578B;
java version &quot;1.8.0_151&quot;
Java(TM) SE Runtime Environment (build 1.8.0_151-b12)
Java HotSpot(TM) 64-Bit Server VM (build 25.151-b12, mixed mode)
&#x7531;&#x4E8E;HotSpot&#x865A; &#x62DF;&#x673A;&#x7684;&#x81EA;&#x52A8;&#x5185;&#x5B58;&#x7BA1;&#x7406;&#x7CFB;&#x7EDF;&#x8981;&#x6C42;&#x5BF9;&#x8C61;&#x7684;&#x8D77;&#x59CB;&#x5730;&#x5740;&#x5FC5;&#x987B;&#x662F;8&#x5B57;&#x8282;&#x7684;&#x6574;&#x6570;&#x500D;&#xFF0C;
&#x56E0;&#x6B64;&#x5F53;&#x5BF9;&#x8C61;&#x5B9E;&#x4F8B;&#x90E8;&#x5206;&#x6570;&#x636E;&#x6CA1;&#x6709;&#x5BF9;&#x9F50;&#x65F6;&#xFF0C;&#x5C31;&#x9700;&#x8981;&#x5BF9;&#x5269;&#x4F59;&#x7684;&#x90E8;&#x5206;&#x8FDB;&#x884C;&#x586B;&#x5145;&#x3002;
&#x8865;&#x9F50;&#x4F4D;&#x7684;&#x5B58;&#x5728;&#x5C31;&#x662F;&#x4E3A;&#x4E86;&#x8865;&#x9F50;8&#x5B57;&#x8282;&#xFF0C;&#x6BCF;&#x4E00;&#x4E2A;java&#x5BF9;&#x8C61;&#x7684;&#x5927;&#x5C0F;&#x90FD;&#x662F;8&#x7684;&#x500D;&#x6570;&#x3002;

// &#x5B57;&#x6BB5;&#x91CD;&#x6392;&#x89C4;&#x5219; (Java HotSpot(TM) )
1&#x3001;&#x603B;&#x7684;&#x89C4;&#x5219;&#x662F;  
(&#x5BF9;&#x8C61;&#x5934; + &#x5B9E;&#x4F8B;&#x6570;&#x636E; + padding) %8 == 0  
&#x4E14;  0 &lt;= padding &lt; 8

2&#x3001;&#x5BF9;&#x8C61;&#x5C5E;&#x6027;&#x6392;&#x5E8F;&#x89C4;&#x5219;&#xFF08;&#x6211;&#x731C;&#x7684;&#xFF09;
&#x5728;&#x5C5E;&#x6027;&#x4E2D;&#x9009;&#x4E00;&#x4E2A;&#x4F7F;&#x5F97;&#x4ECE;&#x8D77;&#x59CB;&#x5F00;&#x59CB;&#xFF0C;&#x6BCF;&#x4E00;&#x6B65;&#x7D2F;&#x52A0;&#x540E; &#x5C3D;&#x5FEB;&#x6EE1;&#x8DB3; sum%8===0 

class TestBean {
    private byte byteValue1 ;
    private char charValue1 ;
    private long longValue2 ;
    private char charValue2 ;
    private double doubleValue1 ;
    private boolean booleanValue2 ;
    private byte byteValue2 ;
    private double doubleValue2 ;
}
---------------- &gt; 
 OFFSET  SIZE    TYPE DESCRIPTION 
      0     4         (object header)
      4     4         (object header) 
      8     4         (object header)                
      // header &#x4E0B;&#x9762;&#x5C5E;&#x6027;&#x987A;&#x5E8F;&#x8DDF;&#x7533;&#x660E;&#x987A;&#x5E8F;&#x53EF;&#x80FD;&#x4E0D;&#x4E00;&#x81F4;
     12     2  char TestBean.charValue1             
     14     2  char TestBean.charValue2             
     16     8  long TestBean.longValue2 
     24     8  double TestBean.doubleValue1 
     32     8  double TestBean.doubleValue2 
     40     1  byte TestBean.byteValue1
     41     1  boolean TestBean.booleanValue2 
     42     1  byte TestBean.byteValue2  
     43     5  (loss due to the next object alignment)
Instance size: 48 bytes
</code></pre>
<h2 id="jol-cli-&#x67E5;&#x770B;-&#x5BF9;&#x8C61;&#x5185;&#x5B58;&#x5E03;&#x5C40;&#x4FE1;&#x606F;"><a name="jol-cli-&#x67E5;&#x770B;-&#x5BF9;&#x8C61;&#x5185;&#x5B58;&#x5E03;&#x5C40;&#x4FE1;&#x606F;" class="anchor-navigation-ex-anchor" href="#jol-cli-&#x67E5;&#x770B;-&#x5BF9;&#x8C61;&#x5185;&#x5B58;&#x5E03;&#x5C40;&#x4FE1;&#x606F;"><i class="fa fa-link" aria-hidden="true"></i></a>1.3. jol-cli &#x67E5;&#x770B; &#x5BF9;&#x8C61;&#x5185;&#x5B58;&#x5E03;&#x5C40;&#x4FE1;&#x606F;</h2>
<pre><code class="lang-text">https://repo.maven.apache.org/maven2/org/openjdk/jol/jol-cli/ 
&#x4E0B;&#x8F7D;&#x4E00;&#x4E2A; full &#x7248;&#x672C;
//&#x67E5;&#x770B;&#x5BF9;&#x8C61;&#x5185;&#x90E8;&#x4FE1;&#x606F;.
String inInfo=ClassLayout.parseInstance(bean).toPrintable() ;
//&#x67E5;&#x770B;&#x5BF9;&#x8C61;&#x5916;&#x90E8;&#x4FE1;&#x606F;&#xFF0C;&#x5305;&#x62EC;&#x5F15;&#x7528;&#x7684;&#x5BF9;&#x8C61;.
String outInfo=GraphLayout.parseInstance(bean).toPrintable() ;
//&#x67E5;&#x770B;&#x5BF9;&#x8C61;&#x603B;&#x5927;&#x5C0F;.
long allInfo=GraphLayout.parseInstance(bean).totalSize();
</code></pre>
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